I came across a good tip a while back about making meeting requests smartphone friendly.

Use the “tel:” prefix and embed the participant passcode (pp) so that can be dialed by one click from a Smartphone. Tel:425-707-2000pp123456 By the way, p is an acceptable substitute for a pause comma. Add more for longer waits.

Awesome - as somebody that loves my new smartphone and the ability to have my calendar everywhere, this is very useful.